Question(s) / Instruction(s):

15,-In a recent survey, 774 of the 1,800 respondents said they preferred C.S.I. (Las Vegas) over C.S.I., Miami or C.S.I., NY. Construct a 98% confidence interval for the proportion of people who preferred C.S.I (Las Vegas).

16,-As part of a study of the earnings of NFL referees, a random sample of 25 members was selected. The mean annual income of the sample was $127,000 with a sample standard deviation of $5,200. Construct a 90% confidence interval estimate of the mean annual income of the entire membership.